In January 2004, NASA's Stardust spacecraft successfully rendezvoused with comet Wild 2, collecting particles released from its surface and interstellar dust. The Stardust comet sample is scheduled to return to Earth in January 2006.
Scott A. Sandford, a NASA research astrophysicist, said he hoped the Stardust Project would help scientists determine "what fraction of [cometary material and dust] is organic, what kinds of organics they are and what possible role they may have played in life's emergence on earth." Read more at NASA.gov(1).
NASA graphic shows Stardust encounter with comet Wild 2.